4D Crop production – ammonia

1. 4D Crop production – ammonia Rikke Albrektsen and Steen Gyldenkærne Danish Centre for Environment and Energy

2. Background • During earlier Guidebook revision, Agriculture and Nature Expert Panel could not identify source of current methodology • Emission factors depended on: • Type of fertiliser • Temperature • Review of methodology was in Workplan • European Environment Agency funding

3. Review of available data • Undertaken by Danish Centre for Environment and Energy • Part of Aarhus University • Overseen by TFEIP • Method: • Literaturesearch • Inquiriesamongstexperts • Worldwide data • All years

4. Data collated • Ammonia emission • Country of origin • Location (laboratory, field) • Soil type • Cropping (bare soil, grass, cereal) • Application method • Air/soil temperature • Soilwetness/rainfall • Measurement method (e.g. wind tunnel)

5. Data collated

6. Results • No significant effect of measurement methodology (!) • Large variability in data • Significant effect of fertiliser type • Significant effect of application method • Broadcast versus incorporation • Effect of temperature?

12. Results • No significanteffect of measurementmethodology (!) • Large variability in data • Significanteffect of fertiliser type • Significanteffect of applicationmethod • Broadcast versus incorporation • Effect of temperature? • Effect of pH?

15. Conclusions • Currently no justification for including temperature or pH in emission estimations • ‘Noise’ overwhelms the chemistry • Make ammonia emissions from broadcast fertiliser only depend on type • Significant reductions with incorporation/injection • Intend to publish as scientific paper

16. Emission factors